CR2450 battery

CR2450 battery: 5-minute fast charge, tens of thousands of times life

After years of development in the new energy vehicle market, ternary batteries with higher energy density have gradually gained the upper hand, while lithium titanate batteries with lower energy density have gradually been marginalized by the market. The reason why lithium titanate batteries have been losing ground in the power battery market is that lithium titanate batteries with low energy density are directly applied to passenger cars with long driving range. This mismatch in application has also caused its incomparable advantages in fast charging, life, safety, etc. to become useless. Confucius emphasized teaching students in accordance with their aptitude in his studies, and lithium titanate batteries also need to play to their strengths and avoid weaknesses and compete in a differentiated manner.

CITIC Guoan Mengguli Power Technology Co., Ltd. (hereinafter referred to as "MGL Power Company") has been committed to the development and application of lithium titanate batteries for more than ten years, and has a deep accumulation of lithium titanate technology and rich experience in battery cell manufacturing and product application. In this season of revival, let's follow MGL's footsteps and listen to where the "spring" of lithium titanate batteries is?

1. Advantages of lithium titanate batteries

Super long life

Lithium titanate is a "zero strain" material, and its volume deformation during charging and discharging is less than 1%, which makes the whole battery have excellent cycle performance and service life. When the CR2450 battery products of MGL Power Company cycle to 80% of the initial capacity under the working conditions of 25℃-100%DOD, the life can reach 10,000 times. Therefore, although the current manufacturing cost of lithium titanate batteries is higher than that of graphite system batteries, its super durability will greatly reduce the cost of battery maintenance and replacement during long-term use.

Super fast charging

Unlike the two-dimensional lithium ion transmission channel of traditional carbon negative electrode materials, lithium titanate materials are spinel structures with three-dimensional fast lithium ion transmission channels. MGL Power Company uses nano-lithium titanate technology, and the battery can be charged within a few minutes, even in extremely cold conditions (-30℃--40℃), it can also be charged and discharged, greatly improving the convenience of users. This feature makes lithium titanate have a unique advantage in the fields of fast charging buses and public transportation with large space volume, short mileage and high operating frequency. When the charging network achieves large-scale coverage in the future, people's requirements for energy density will gradually fade, and the ultimate user experience will become the main driving force for customer selection.

Ultra-high safety

The lithium insertion potential of lithium titanate negative electrode is about 1.55V (vs. Li+/Li), which is much higher than the reduction potential of metallic lithium. Even fast charging under low temperature conditions is difficult to precipitate lithium dendrites, ensuring the safety of lithium titanate batteries in a wide temperature working range. In addition, the lithium titanate material itself has extremely low conductivity. When the battery is punctured, the puncture point is instantly discharged and insulated, achieving separation from other parts of the electrode and effective control of the failure range. Even in extreme abuse, the non-flammability of lithium titanate itself and the lower exothermicity of failure reaction relative to graphite negative electrode will greatly reduce its failure risk and the degree of danger after failure. Therefore, in the fields of rail transportation, electric buses, electric ships, etc., which have extremely strict requirements on safety performance, lithium titanate batteries have the unique advantage of ultra-high safety compared with graphite negative electrode batteries. All models of CR2450 battery products of MGL Power Company have passed the national standard safety test project (GB/T31485).

MGL Power Company has been deeply engaged in the development of lithium titanate batteries for thirteen years, and has carried out technical research on many key issues in the manufacturing and application of lithium titanate batteries. Through the development of new mixing processes, the dispersion problem of nano lithium titanate materials is solved to ensure good processing performance and uniformity of electrode production; through material surface treatment technology, moisture control technology, electrolyte system matching and formation process design optimization, the flatulence problem of lithium titanate batteries in high-temperature operation is solved to ensure its safety and reliability during use; at the same time, a lithium titanate system model calculation platform is built to assist battery design optimization, and key control parameters in electrode design, structural design and working conditions are found from multiple angles such as microscopic electrochemical reactions, electrode process dynamics and heat generation characteristics, so as to achieve rapid customized product development suitable for different application scenarios. At present, the company has more than ten technical patents related to lithium titanate batteries.

MGL Power Company has launched three generations of typical battery cell products, namely, power type 8.5Ah, energy power type 25Ah and energy type VDA40Ah. Among them, the power type 8.5Ah battery cell has a power density of up to 2900W/kg (50% SOC) and has ultra-high rate characteristics of 12C charging and 25C discharging; the energy power type 25Ah battery cell maintains high power and high rate characteristics, while its mass energy density is increased by about 21.3% compared with the power type 8.5Ah battery cell; the energy type VDA40Ah battery cell can achieve an energy density of 110Wh/kg through lightweight structural design and electrode formula optimization, which is at the leading level among domestic and foreign CR2450 battery manufacturers.

2. Application cases of lithium titanate batteries

MGL Power Company has established good long-term cooperative relations with many high-quality customers in the fields of fast-charging buses and rail transit, such as Beijing Public Transport Group, Youth Public Transport Group, CRRC Changke Co., Ltd., CRRC Sifang Co., Ltd., and Shenzhou High-speed Railway, for CR2450 battery products. The product's electrical performance, safety performance, and durable reliability have been widely recognized by customers.

At present, the power-type 8.5Ah battery cell is mainly used in the field of fast-charging buses. It was first industrialized in 2014 and applied in batches to Beijing Bus Route 102 trackless buses.

So far, it has been in operation for more than 4 years without any battery safety failures, and regular factory maintenance and calibration have not shown obvious capacity and power attenuation;

Energy-power-type 25Ah and energy-type VDA40Ah battery cells are customized products developed in the field of rail transit. The company has successively provided multiple energy storage systems for the Changzhou tram project, the Delingha tram project, and the "Fuxing" standard EMU.

Among them, the Delingha tram equipped with 25Ah energy-powered cells runs on the Qinghai-Tibet Plateau, which is currently the highest-altitude tram route. The operational feedback results show that MGL Power's lithium titanate products can withstand the harsh environment of high cold and low pressure; the "Fuxing" EMU equipped with VDA40Ah energy-powered EMU was tested in April 2018. This is the first time that China's standard EMUs use lithium titanate batteries for power supply, and it is a high recognition of the safety of MGL Power's CR2450 battery products.

3. Conclusion

In addition to the continuous transformation of traditional passenger cars, commercial vehicles, and buses, rail transit, ships, aircraft and other fields have gradually joined the new energy industry. The future will be an era of new battery technologies and intelligent platforms. Although lithium titanate batteries do not have an advantage in energy density, they have unparalleled advantages in fast charging, safety and lifespan. Through differentiated competition, they can win a place in fields with high requirements for charging speed and frequency. MGL Power will also continue to deepen the development of lithium titanate fast-charging battery technology, constantly explore its performance limits and application potential, and bring customers a more superior and convenient user experience.

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